For through wondering human beings now and in the beginning have been led to philosophizing.

Neither old people nor sour people seem to make friends easily; for there is little that is pleasant in them.

The things best to know are first principles and causes, but these things are perhaps the most difficult for men to grasp, for they are farthest removed from the senses.

When Pleasure is at the bar the jury is not impartial.

A friend is another I.

Man perfected by society is the best of all animals; he is the most terrible of all when he lives without law, and without justice.

The virtue of a faculty is related to the special function which that faculty performs. Now there are three elements in the soul which control action and the attainment of truth: namely, Sensation, Intellect, and Desire. Of these, Sensation never originates action, as is shown by the fact that animals have sensation but are not capable of action.